buttress threads...

[Anonymous]

i have a standard 16 tpi buttress external thread. does anyone know the
PROPER callout for this thread type? for example, on the drawing do i say
"BUTTRESS THREAD, CLASS 1, 16 TPI, L.H. PITCH"?


thanks,

--
Mark A. Bystry
Engineer
Ziggity Systems, Inc.
mbystry@ziggity.com

[Anonymous]

Think you should include the diameter but I call them out same way I call
out other threads: 1 1/2-16 BUTRESS LH. Worked so far. Haven't seen a
standard on it though. If it's different in a standard, someone will correct
me I'm sure.
~Larry


"Mark A. Bystry" wrote in message
news:9EDA0C3908E793A5C82E9F33E7C8D61C@in.WebX.maYIadrTaRb...
> i have a standard 16 tpi buttress external thread. does anyone know the
> PROPER callout for this thread type? for example, on the drawing do i say
> "BUTTRESS THREAD, CLASS 1, 16 TPI, L.H. PITCH"?
>
>
> thanks,
>
> --
> Mark A. Bystry
> Engineer
> Ziggity Systems, Inc.
> mbystry@ziggity.com
>
>

[Anonymous]

Hi, Mark.

Have you got a Machinery's Handbook handy? It gets a little complicated (at
least for me).

Basic is 2.5-8 BUTT-2A for 2.5 dia, 8 tpi, class 2, but there's more (push /
pull, flat root, multiple start, LH, etc.) If you just want to tag the LH to
what you've got it would be -2A-LH

====================


"Mark A. Bystry" wrote in message
news:9EDA0C3908E793A5C82E9F33E7C8D61C@in.WebX.maYIadrTaRb...
i have a standard 16 tpi buttress external thread. does anyone know the
PROPER callout for this thread type? for example, on the drawing do i say
"BUTTRESS THREAD, CLASS 1, 16 TPI, L.H. PITCH"?


thanks,

--
Mark A. Bystry
Engineer
Ziggity Systems, Inc.
mbystry@ziggity.com

[Anonymous]

...ok. what page is that on. my book is the #25 edition...

so far i have 3/4-16 BUTTRESS, CLASS 1, L.H. i think i'm satisfied with that
but i wonder if there is a 2A or 2B designation also.

--
Mark A. Bystry
Engineer
Ziggity Systems, Inc.
mbystry@ziggity.com

[Anonymous]

ok. thanks larry...

--
Mark A. Bystry
Engineer
Ziggity Systems, Inc.
mbystry@ziggity.com
"Larry Caldwell" wrote in message
news:6A427E8022FA7F7EDB3A5F40E474AE3C@in.WebX.maYIadrTaRb...
> Think you should include the diameter but I call them out same way I call
> out other threads: 1 1/2-16 BUTRESS LH. Worked so far. Haven't seen a
> standard on it though. If it's different in a standard, someone will
correct
> me I'm sure.
> ~Larry
>
>
> "Mark A. Bystry" wrote in message
> news:9EDA0C3908E793A5C82E9F33E7C8D61C@in.WebX.maYIadrTaRb...
> > i have a standard 16 tpi buttress external thread. does anyone know the
> > PROPER callout for this thread type? for example, on the drawing do i
say
> > "BUTTRESS THREAD, CLASS 1, 16 TPI, L.H. PITCH"?
> >
> >
> > thanks,
> >
> > --
> > Mark A. Bystry
> > Engineer
> > Ziggity Systems, Inc.
> > mbystry@ziggity.com
> >
> >
>
>

[Anonymous]

Yeah, forgot the class didn't I. Should have check MHB first, I guess, since
your example is the same as listed there ... now that I have looked. I could
have used it to. Duh! I use them on Hyd. Cyls. mostly.
~Larry


"Jeff Howard" wrote in message
news:4B08CC19607C15AC8BD974EF25106CEF@in.WebX.maYIadrTaRb...
> Hi, Mark.
>
> Have you got a Machinery's Handbook handy? It gets a little complicated
(at
> least for me).
>
> Basic is 2.5-8 BUTT-2A for 2.5 dia, 8 tpi, class 2, but there's more (push
/
> pull, flat root, multiple start, LH, etc.) If you just want to tag the
LH to
> what you've got it would be -2A-LH
>
> ====================
>
>
> "Mark A. Bystry" wrote in message
> news:9EDA0C3908E793A5C82E9F33E7C8D61C@in.WebX.maYIadrTaRb...
> i have a standard 16 tpi buttress external thread. does anyone know the
> PROPER callout for this thread type? for example, on the drawing do i say
> "BUTTRESS THREAD, CLASS 1, 16 TPI, L.H. PITCH"?
>
>
> thanks,
>
> --
> Mark A. Bystry
> Engineer
> Ziggity Systems, Inc.
> mbystry@ziggity.com
>
>
>
>

[Anonymous]

1345 in MHB 21, but it's under "Buttress Thread Designations" in the
Buttress Thread section.
~Larry

"Mark A. Bystry" wrote in message
news:3DB204A20F02830A61DAFAEDE5E228CD@in.WebX.maYIadrTaRb...
> ...ok. what page is that on. my book is the #25 edition...
>
> so far i have 3/4-16 BUTTRESS, CLASS 1, L.H. i think i'm satisfied with
that
> but i wonder if there is a 2A or 2B designation also.
>
> --
> Mark A. Bystry
> Engineer
> Ziggity Systems, Inc.
> mbystry@ziggity.com
>
>

[Anonymous]

The -2A mentioned gives the class and indicates external (A) or internal
(B). I also am used to seeing the class at the end of the callout, like
.25-20UNC-2A.

Ed R